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LBI-31985
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Страница 1: ...multipliers to provide the station operating frequency The PA assembly uses 3 RF amplifier stages to drive a two transistor power output circuit Each stage employs matching networks consisting of discrete components and strip line technology The RF output power is fed to the an tenna through a circulator containing a low pass filter The PA assembly includes a power control module The power control...
Страница 2: ...or thereby preventing overmodu lation while preserving intelligibility TEST EQUIPMENT 1 An audio oscillator GE Model 4EX6A10 2 A frequency modulation monitor 3 Voltmeter 4 GE Test Set Model 4EX3A11 or 4EX8K12 5 Frequency Counter 6 Oscilloscope 7 50 ohm Wattmeter PROCEDURE 1 Connect the audio oscillator and the meter across audio input terminals J10 Green Hi and J11 Black Lo on GE Test Set and conn...
Страница 3: ...t 875 MHz 1 PPM is 875 Hz With an operating frequency of 851 MHz set the oscilla tor for a reading of 374 Hz 0 44 x 851 Hz higher than the licensed operating frequency If a negative correction factor is obtained at temperatures above 27 5 C set the oscillator for the indicated PPM lower than the licensed operating fre quency TRANSMITTER ALIGNMENT EQUIPMENT REQUIRED 1 GE Test Set Model 4EX3A11 or T...
Страница 4: ...er reading 2 C MULT 1 T102 and T103 See Procedure Tune T102 for maximum meter reading then tune T103 for a dip in meter reading 3 D MULT 2 T104 and T105 See Procedure Tune T104 for maximum meter reading and then tune T105 for a dip in meter reading 4 F MULT 3 T106 and C157 See Procedure Tune T106 for maximum meter reading and then tune C157 for a dip in meter reading 5 G MULT 4 C159 and Z101 See P...
Страница 5: ...103 T101 Q102 Q103 T101 ICOM Q102 Q103 T101 ICOM C MULT 1 Q104 T103 T101 T102 Q104 T101 T102 Q104 T103 D MULT 2 Q105 T105 T103 T104 Q105 T103 T104 Q105 T105 F MULT 3 Q106 C155 Q106 T105 T106 Q106 T105 T106 L105 G MULT 4 Q107 Z101 Z102 Q107 C159 C157 Q107 C159 C157 Z101 Z102 A REL OUTPUT Q107 Q107 C174 CR102 R154 R153 851 870 MHz 100 WATT TRANSMITTER Issue 1 LBI 31985 LBI 31985 4 ...
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